Chubb / Union 3M50 Hook Bolt Mortice Lock

5 Detainer mechanisms for sliding or hinged doors.. The hook bolt clutches the lock to the doorframe. whilst a "steady" bolt prevents the door being. lifted to release the hook.. Key operations from both sides of the door.. Masterkeyable with other detainer locks.. Case size 70mm - basket 43mm.. Supplied with 2 keys as standard.. Finishes available: Simulated brass..